Great Britain's Alistair Brownlee has become the first triathlete to retain an Olympic title as he led brother Jonny to a family gold and silver in Rio.
The brothers, who finished first and third in London, did not put a foot wrong in front of packed crowds on Copacabana.
It came down to a race between them and Alistair made his break on the third lap of the run, pulling away to claim a dominant victory Jonny comfortably held on for silver, making the brothers the first to finish one and two at an Olympics since Italians Piero and Raimondo D'Inzeo in equestrian in 1960.
The final gap to Jonny was six seconds, with Henri Schoeman taking bronze for South Africa.
Team GB sailors Hannah Mills and Saskia Clark have brought their 470 partnership to a dream end by wrapping up Olympic gold.
Four years on from taking silver on the home waters of Weymouth and Portland, the duo arrived in Brazil determined to go one better.
It was a challenge Mills and Clark met with aplomb, producing an opening series as impressive as it was consistent to see them head into the women's 470 medal race all but assured of gold.
The British duo merely had to complete the double-point medal race without disqualification and duly did so, easing home in eighth in the delayed finale to rubber-stamp glory.
Marcus Ellis and Chris Langridge won Great Britain's first Olympic badminton medal since 2004 -- and its first ever in the men's doubles.
The pair triumphed 21-18, 19-21, 21-10 in the men's doubles bronze medal match against China's Biao Chai and Hong Wei at Riocentro.
Ellis and Langridge won a tense opening game before the Chinese drew level when Ellis served into the net, but the British combination stormed away with the decider and secured a podium place.
The last Britons to collect an Olympic badminton medal were Nathan Robertson and Gail Emms in the Athens Games mixed doubles.
Elsewhere in Kayaking, Liam Heath and Jon Schofield have claimed a silver medal for Team GB, an upgrade of the bronze medal the pair won at London 2012.
The pair started impressively and maintained their pace to cross the line in 32.368 seconds.
"As soon as we saw it on the board, Jon absolutely went mental." Heath said upon returning to dry land.
Great Britain's men angrily defended their medal prospects in the 4x100 metres relay after only sneaking into the final.
Running from the inside, the quartet of Richard Kilty, Harry Aikines-Aryeetey, James Ellington and Chijindu Ujah came home third in their semifinal in 38.06 seconds.
The time ranked them seventh of the eight qualifiers for the final and Ellington said they would be "praying" and keeping their "fingers crossed" for a better lane. Those prayers, though, were not answered.
"It would have been 37.7secs in a better lane," said Ellington. "It's (38.06s) probably the fastest time ever from lane one, so we weren't playing it safe. This is the Olympics, so we've got to lay it down in the heats and the finals."
Britain's women's quartet of Asha Philip, Desiree Henry, Dina Asher-Smith and Daryll Neita advanced to the final in rather more comfortable fashion than the men, finishing second to Jamaica in 41.93.
They will also have hopes of a medal, having broken the British record last month.